Acer ALTOS 700ED User Manual
System Board
This high-performance system board supports both the 486-series
and the Intel Penti um micr oprocessors. The board does not i ncl ude
the CPU and the second-lev el cache. Instead, it accommodates a
separate board that carr ies both the CPU and t he second-level cache.
This feature allows maximum upgradability and flexibility.
The board features the single-chip upgrade technology that makes
CPU upgrades easy and economical, and also the multiple-CPU
upgrade technology that can convert your machine into a
multiprocessor system. These innovative technologies protect your
investment well into the future.
Standard features such as two serial ports, one parallel port, a
diskette dri ve interf ace, and an embedded fi xed disk dr ive i nterface
reside on the system board.
The system board has a 8/16-MB base memory and supports a
maxi m um m emory of 128 MB using 32-MB SIMMs. When you install
the dual-Pentium (3.3V) CPU board, you get four additional SIMM
sockets for a total system memory of 256 MB using 32-MB SIMMs.
When you install the Pentium (3.3V-ECC) CPU board, you get two
additional SIMM sockets that support a max imum m emory of 64 MB
using 32-MB SIMMs, for a total system memory of 192 MB.
System Board 1-1
1.1 Major Components
The system board has the following major components:
•
Four 72-pin SIMM sockets labeled Bank 0 and Bank 1 (two
sockets compri se one bank)
•
One CPU board slot
•
Fiv e 32-bi t EI SA ex pansi on slots supporti ng m aster/ slave add-on
cards
•
Three PCI l oc al bus slots
•
128/256-KB Flash memory for easy system BIOS upgrade
•
I/O interfaces for two serial ports, one parallel port, diskette
drives, IDE drives, and PS/2 keyboard and mouse
•
Enhanced IDE on PCI bus supports two IDE ports for four IDE
devices (IDE models)
•
Onboard AIC-7870 chip supports one 8-bit Fast SCSI-II port
(SCSI m odels)
•
Power connector 1 for 200-watt/350-watt switching power supply
(for I D3P and IDAB housings)
•
Power connector 2 for 350-watt switching power supply
(additi onal connector for models using IDU housing)
Figure 1-1 shows the location of the m ajor components on the board.
1-2 User’s Guide
1 COM 2
2 COM 1
3 Parallel port interface
4 Diskette drive interface
5 IDE hard disk drive interface
6 Power connector 1
(200/350-watt)
7 SIMM sockets
8 Power connector 2 ( 350- watt)
9 Wide SCSI interface
10 Fast SCSI- 2 inter face
11 CPU board slot
12 Power LED connector
13 Hard disk LED connector
14 Fan connectors
15 Turbo/Reset connect or ( J23)
16 Speaker connector ( J24)
17 Real-time clock
18 BIOS
19 EISA expansion slots
20 PCI slots
21 PS/2 mouse connector
22 PS/2 keyboard connector
Figure 1-1 System Board Layout
System Board 1-3
1.2 ESD Precautions
Always observe the foll owing precauti ons bef ore i nstall i ng any system
component:
1. Do not remove a board from its packaging unl ess you are ready
to install it.
2. Wear a wrist grounding strap before handling electronic
components. Wrist grounding straps are available at most
electronic component stores.
DO NOT attempt the procedures in the
following sect ions unles s y ou are confident of
your capability to per form them. Otherw ise,
ask a service tec hnic ian for assistance.
1.3 Upgrading the Memory
The system comes with a standard 8/16-MB mem ory, ex pandable up
to 128 MB, 192 MB, or 256 MB depending on t he type of CPU boar d
installed. You can upgrade the system memory by installing single
inline memory modules (SIMMs) into the SIMM sockets or by
changing the SIMMs f or a hi gher m em or y conf i gurat i on. T he f our 72pin SIMM sockets support 4-MB and 16-MB single-density as well as
8-MB and 32-MB double-density SIMMs.
1.3.1 Rules for Adding Memory
•
Always install SIMMs from the l owest bank f irst. F or exampl e,
use bank 0 before bank 1, bank 1 before bank 2, and so on.
•
Always remove SIMMs from the highest bank first. For exam ple,
bank 3 before bank 2, and so on.
•
Use only the same ty pe of SIMM in a given bank
•
You may combine different types of SIMMs for a particular
memor y conf igurati on as long as the SI MMs in each bank are of
the same type.
1-4 User’s Guide
Table 1-1 li sts the avai lable m emory conf igurati ons when the system
uses either an IntelDX4, Pentium (5V), si ngle-Pentium ( 3.3V), or a
Pentium (3. 3V-ALI) CPU board.
Table 1-1 Memory Configurat ions
Bank 0 Bank 1 Total
S0 S1 S0 S1 Memory
4 MB 4 MB 8 MB
4 MB 4 MB 4 MB 4 MB 16 MB
8 MB 8 MB 16 MB
8 MB 8 MB 4 MB 4 MB 24 MB
4 MB 4 MB 8 MB 8 MB 24 MB
8 MB 8 MB 8 MB 8 MB 32 MB
16 MB 16 MB 32 MB
16 MB 16 MB 4 MB 4 MB 40 MB
4 MB 4 MB 16 MB 16 MB 40 MB
16 MB 16 MB 8 MB 8 MB 48 MB
8 MB 8 MB 16 MB 16 MB 48 MB
16 MB 16 MB 16 MB 16 MB 64 MB
32 MB 32 MB 64 MB
32 MB 32 MB 4 MB 4 MB 72 MB
4 MB 4 MB 32 MB 32 MB 72 MB
32 MB 32 MB 8 MB 8 MB 80 MB
8 MB 8 MB 32 MB 32 MB 80 MB
32 MB 32 MB 16 MB 16 MB 96 MB
16 MB 16 MB 32 MB 32 MB 96 MB
32 MB 32 MB 32 MB 32 MB 128 MB
1
* S0 and S1 stand for socket 0 and socket 1 respective ly.
1
When using the IntelDX4, Penti um (5V), single-Pentium (3.3V), a n d
Pentium (3.3V-ALI) CPU boards
System Board 1-5
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